TS259B-0502
5. Push “CLOCK” button again, or wait a few seconds
to make all the displays stop flashing. The time is
now set. To readjust, begin again at step one.
3.5 Setting Relative Humidity
Setpoint
The relative humidity setpoint operates the dehumidifier
function of the Ultra-Aire. It has no effect on any other
function of the unit. The control senses the ambient
relative humidity of the space in which it is located. The
ambient condition is displayed on the right in the relative
humidity display sequence, under the word “HUMIDITY”.
The current setpoint is displayed on the left, under the
word “SET”.
If the setpoint is equal to or greater than the current
ambient condition, the space does not need to be dried,
so the dehumidifier function will be off.
Example: Setpoint: 50% RH
Current condition 45% RH = Dehumidifier off, red
“DEHU” indicator not lit.
If the setpoint is less than the ambient condition, the
dehumidifier will be on, and the red “DEHU” indicator will
be lit. The space is more humid than the setpoint, so the
controller operates the dehumidifier to dry the space.
Example: Setpoint: 50% RH
Current condition: 55% RH = Dehumidifier on, red
“DEHU” indicator lit.
To set the relative humidity setpoint, press the “HUM”
button. The display will show the “HUMIDITY” display,
and the word “SET” will flash. Use the “SET” + or –
buttons to adjust the relative humidity setpoint as
desired. Therma-Stor Products recommends relative
humidity levels of around 45% in the summer, and lower
levels in the winter if you live in a cold climate. It is not
recommended that the humidity setpoint be set below
35%. In order to dry the home in the winter in a cold
climate, use the ventilation function of the system rather
than the dehumidifier function. Call the factory or refer to
the owner’s manual for more information.
3.6 Fan Setting and Operation
Use the “FAN” button to adjust the fan operation. There
are 3 choices for fan operation: “on”, “off” (denoted by
“OF”), or program (denoted by “Pr”). To set operation,
1. Press the “FAN” button. The display will indicate
the current fan setting.
2. Use the “SET” + or – buttons to adjust fan operation
(“on”, “OF”’ or “Pr”). Press the “FAN” button again
or leave the unit alone for 10 seconds to return to
home state.
Fan On Fan Off Fan Program
The fan display reading in the normal display sequence
does not indicate the current fan setting, it indicates the
current fan status, and will always read either on or off.
With the fan in the “on” mode, the fan will run
continuously. This does not effect either the
dehumidification or ventilation functions of the system.
In other words, the system may or may not be ventilating
or dehumidifying while the fan is running. Common
reasons for operating the fan continuously are
continuous filtration and air recirculation.
With the fan in the “off” or “program” mode, the fan will
operate only when needed by other functions of the
system. The fan will remain off unless the system is
dehumidifying and/or ventilating. The fan always runs
during dehumidification, and it also always runs during
ventilation. To completely turn the system off, use the
“ON/OFF” button as described earlier. To adjust the
ventilation mode, see the “damper operation and setting
(ventilation)” section.
3.7 Damper Operation and
Setting (Ventilation)
The damper setting controls the ventilation function of
the system. It has no control over the dehumidification
function, although the ventilation function can and should
be used to dry the space depending on the climate and
the outside air conditions. See “programming notes”
section and call the factory or dealer for more details.
In order to provide ventilation, the damper must be open
(“on”) and the fan must be running. The controller takes
care of these two functions automatically, so that
whenever the damper is open (“on”), the fan is running.
This is true even if the fan has been set to the “off”
mode.
The ventilation indicator “B” will be lit whenever the unit
is ventilating
There are three damper operation modes, “on”, “off”
(denoted by “OF”), and program (denoted by “”Pr”). With
the damper in the “on” mode, the damper will be open
and the fan of the system will be operating in order to
introduce fresh air into the space. Use this mode for
continuous fresh air ventilation. The fan is always on
when the damper is open. When in “off” mode, the
damper will not open and the system will not ventilate.
